Why is radiation heat transfer in forced-air-cooled systems disregarded?
Q: Explain the work (electrical) done on an adiabatic system is equal to the increase in the energy of…
A: As per the 1st law of thermodynamics, within a reversible closed system, net heat interaction is…
Q: If heated at the same rate and in the same manner, which would have a more even heat distribution…
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Q: An old gas turbine has an efficiency of 21 percent and develops a power output of 6000 kW. Determine…
A: Given Data: The turbine efficiency is: η=21 % The power developed in output is: W=6000 kW The…
Q: The mass flow rate of water entering a turbine is 17.7 kg/s and its enthalpy is 3817.2 kJ/kg. The…
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Q: An adiabatic process is one during which no energy enters or leaves the system by heat
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Q: Consider an adiabatic turbine operating steadily. Does the work output of the turbine have to be…
A: Adiabatic expansion: The adiabatic process of an ideal gas is defined as the expansion of the gas…
Q: How do you calculate the heating surface of a boiler?
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Q: What is an adiabatic process?
A: ADIABATIC PROCESS An adiabatic process is a heat transfer-free process from the system or from the…
Q: Why heat engines are intentionally equated at high temperatures?
A: Heat Engines: The engines that convert the heat produced from chemical energy or any other form of…
Q: Determine the temperature of hot flue gases & efficiency of chimney for maximum discharge through…
A: Given:Height of the chimney, h=80 mTa=27+273=300 KTemperature of hot gas, Tg=110+273Tg=383 Kmass of…
Q: Does a refrigerator that has a higher COP necessarily have a higher second-law efficiency than one…
A: Let's first understand the coefficient of performance (COP) of a refrigerator:The coefficient of…
Q: A classroom that normally contains 60 people is to be air-conditioned using window air- conditioning…
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Q: What is the difference between an adiabatic system and an isolated system?
A: Given data What is the difference between an adiabatic system and an isolated system.
Q: In a stirling engine the piston is pushed by O a. hand O b. the connecting rod and flywheel O c.…
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Q: |cen84959_chi8-ap01.qxd 8/11/06 1121 PH Page 928 928 Thermodynamics TABLE A-11
A: P-v diagram of refrigerant Note: For drawing the T-v diagram upper image is not clear.
Q: Does a power plant that has a higher thermal efficiency necessarily have a higher second-law…
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Q: Answer the following: 1- How does the human body respond to (a) hot weather, (b) cold weather, and…
A: 1) The human body responds to the cold and hot environment through a process called…
Q: A coal-burning steam power plant produces a net power of 300 MW with an overall thermal efficiency…
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Q: pressure = 4,835 kPa and h = 3,260.71 kJ/kg,
A: Handwriting.jpg
Q: what is the major differences between centrifugal compressors and axial compressors?
A: compressor: A compressor is a device which is used to increase the pressure of compressible fluids…
Q: Define the isentropic, polytropic, and isothermal compression processes between the same pressure…
A: The isentropic, polytropic and isothermal compression process between the same pressure limits can…
Q: The Refrigerating Effect of 94 tons of refrigeration is 127.75 kJ/kg. Determine
A: given:refrigeration effect =127.75kj/kgrffrigerator of 94 tons
Q: What are the energy types in a closed and open system?
A: Given: Closed and open system Energy types in closed and open system.
Q: 2 kg of Refrigerant-134a contained in a piston-cylinder device undergoes a reversed Carnot cycle.…
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Q: Does a heat engine that has a thermal efficiency of 100 percent necessarily violate the second law…
A: Yes, a heat engine having 100% thermal efficiency will violate the Kelvin Planck statement of the…
Q: 1. A Freon-12 vapor compression system operating at a condenser temperature of 40 °C and an…
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Q: What is Irreversible Adiabatic Compression?
A: Reversible process: A process is a process in which the system can return into its original…
Q: Isovolumetric process is also known as Select one: O a. Constant Pressure Process O b. Constant…
A: The term Isovolumetric is a combination of two words that is iso and volumetric where iso means same…
Q: Show that the power produced by a wind turbine is proportional to the cube of the wind velocity and…
A: The power generated depends primarily on the discharge through the turbines and the hydraulic head.…
Q: What is fuel combustion? How does it affect the performance of an engine?
A: The performance of an engine is expressed by the following factors: The power produced by the…
Q: The maximum efficiency of a heat engine works between 660 K and 323 K is
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Q: Sensible heat transfer from a warm body to a cold body is only possible when
A: Sensible heat: The heat that is required to increase unit temperature of unit mass of any object is…
Q: Identify the first law of thermodynamics as simply a statement of the conservation of energy…
A: According to first law of thermodynamics when a closed system is made interaction from the…
Q: What is a blackbody? How do real bodies differ from a blackbody?
A: Thermal radiation is the mode of heat transfer which do not required any medium to propagate. This…
Q: Air entering an adiabatic gas turbine at a temperature of 580ºC has a pressure of 1516 kPa. What is…
A: Solution:
Q: how the efficiency of a compressor can be calculated??
A: Compressor Efficiency can be calculated as; Gas compression cab be expressed in terms of pressure…
Q: What is the difference between refrigerators and heat pumps? From their mechanics and theory
A: The heat pump and refrigerator can be described as: Refrigerator: The refrigerator is a device that…
Q: Illustrate the contradiction between refrigeration cycles and the second law of thermodynamics while…
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Q: Which is not a solar thermal electric application? O a. Solar power tower O b. Photo voltaic O c.…
A: following is the answer to the above question-
Q: Is aircon-ditioner an example of thermodynamic system inside the house? Is it an open system, closed…
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Q: • To increase the natural circulation in boiler, it requires: a. Shorter boiler, higher operating…
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Q: Show that the air standard efficiency of a gas turbine can be expressed in terms of pressure ratio…
A: It is required to determine efficiency of Gas turbine cycle in terms of pressure ratio
Q: Describe the Entropy and Entropy Generation in Daily Life
A: given: Describe the Entropy and Entropy Generation in Daily Life
Q: coal-burning steam power plant produces a net power of 300 MW with an overall thermal efficiency of…
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Q: To increase the natural circulation in boiler, it requires: a. Shorter boiler, higher operating…
A: Taller boiler produces better pressure difference and bigger flow rates. Higher operating pressure…
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- what is the mechanism of natural gas Compressors?What is an adiabatic process?The steam from a boiler enters a steam turbine and work is done by the steam turbine. After work done, the steam is condensed by condenser. The condensate (water) is again sent to the boiler to generate the steam. Choose the correct type of thermodynamic system involve in this operation. O a. Open system O b. Adiabatic system O C. Isolated system o d. Closed system
- Explain the thermodynamic processes involved in a multi-stage compression system, outlining the specific efficiency considerations at each stage, and how these processes differ from a single-stage compression system.How do you calculate the heating surface of a boiler?A coal-burning steam power plant produces a net power of 300 MW with an overall thermal efficiency of 32 percent. The actual gravimetric air-fuel ratio in the furnace is calculated to be 12 kg air/kg fuel. The heating value of the coal is 28,000 kJ/kg. Determine (a) the amount of coal consumed during a 24-hour period and (b) the rate of air flowing through the furnace Answers: (a) 2.89 X 106 kg, (b) 402 kg/s
- Air conditioning units are sometimes placed on the roof of homes in the city. Occasionally, the air conditioners cause an undesirable hum throughout the upper floors of the homes. Why does this happen? What can be done to reduce the hum?السؤال الثالث The thermodynamic properties of refrigerant R22 mixture of liquid and vapor leaving the expansion device and entering the evaporator are: pressure of 498 KPa, temperature of 0 °C, fraction dryness (x) of 0.238, saturated liquid enthalpy of 200 kJ/kg, and saturated vapour enthalpy of 405 kJ/kg. The pressure of this refrigerant at the entrance of the condenser is measured to be 19.3 bar After the subcooling process, the enthalpy in (kJ/kg) and the pressure in (MPa) of this refrigerant have been measured and were found to be 199 47 kJ/kg and 2.3 MPa. 239. 68 kJ/kg and 1.96 MPAO 248.79 kU/kg and 1.93 MPa 110 52 kJ/kg and 3.1 MPa 1:29 PM 91°F Sunny 5/14/2022The catalogue for a refrigerant 22, four-cylinder, hermetic compressor operating at 29 r/s. a condensing temperature of 40 °C and an evaporating temperature of -4 °C shows a refrigeration capacity of 96.4 kW. At this operating points the motor (whose efficiency is 90 percent) draws 28.9 kW. The bore of the cylinders is 87 mm and the piston stroke is 70 mm. The performance data are based on 8 °C of subcooling of the liquid leaving the condenser. Compute 3.1 the actual volumetric efficiency and 3.2 the compression efficiency.